Fracture of tooth enamel from incipient microstructural defects

Chai, Herzl; Lee, James J.-W.; Lawn, Brian R.

doi:10.1016/j.jmbbm.2009.08.002

Cited by 30 publications

(21 citation statements)

References 25 publications

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“…Chai et al [40] described the enamel "tufts" as intrinsic defects within the microstructure that serve as the starting point for the development of radial and margin cracks in teeth. These natural cracks, which can be found in the enamel, extend from the DEJ toward the occlusal surface over tens of micrometers and at the interface of the rods [41].…”

Section: On the Fracture Resistance Of Teethmentioning

confidence: 99%

On the Mechanics of Fatigue and Fracture in Teeth

Yahyazadehfar

Ivancik

Majd

et al. 2014

Applied Mechanics Reviews

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Tooth fracture is a major concern in the field of restorative dentistry. However, knowledge of the causes for tooth fracture has developed from contributions that are largely based within the field of mechanics. The present manuscript presents a technical review of advances in understanding the fracture of teeth and the fatigue and fracture behavior of their hard tissues (i.e., dentin and enamel). The importance of evaluating the fracture resistance of these materials, and the role of applied mechanics in developing this knowledge will be reviewed. In addition, the complex microstructures of tooth tissues, their roles in resisting tooth fracture, and the importance of hydration and aging on the fracture resistance of tooth tissues will be discussed. Studies in this area are essential for increasing the success of current treatments in dentistry, as well as in facilitating the development of novel bio-inspired restorative materials for the future.

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Section: On the Fracture Resistance Of Teethmentioning

confidence: 99%

On the Mechanics of Fatigue and Fracture in Teeth

Yahyazadehfar

Ivancik

Majd

et al. 2014

Applied Mechanics Reviews

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“…5b, c). The tufts extend only when forces are high enough [97], thus protecting the dentinal core by directing cracks in the opposite direction. Such cracks that do pass from the exterior inwards may well be deflected by decussating enamel; of course, this may sacrifice a chip of enamel, but it saves the tooth (fig.…”

Section: Overview Of Mechanical Damage To Enamelmentioning

confidence: 99%

The Wear and Tear of Teeth

Lucas¹,

Casteren²

2014

Med Princ Pract

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A review is presented of the mechanical damage suffered by tooth crowns. This has been the subject of much recent research, resulting in a need to revise some of the thinking about the mechanisms involved. Damage is classified here by scale into macro-, meso- and microfracture. The focus is on the outer enamel coat because this is the contact tissue and where most fractures start. Enamel properties appear to be tailored to maximize hardness, but also to prevent fracture. The latter is achieved by the deployment of developmental flaws called enamel tufts. Macrofractures usually appear to initiate as extensions of tufts on the undersurface of the enamel adjacent to the enamel-dentine junction and extend from there into the enamel. Cracks that pass from the tooth surface tend to be deflected by an enamel region of high toughness; if they find the surface again, a chip (mesofracture) is produced. The real protection of the enamel-dentine junction here is the layer of decussating inner enamel. Finally, a novel analysis of mechanical wear (microfracture) suggests that the local toughness of the enamel is very important to its ability to resist tissue loss. Enamel and dentine have contrasting behaviours. Seen on a large scale, dentine is isotropic (behaving similarly in all directions) while enamel is anisotropic, but vice versa on a very small scale. These patterns have implications for anyone studying the fracture behaviour of teeth.

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“…Enamel also contains tufts that may act as ''seeds" for cracks, thereby contributing to greater compliance in the vicinity of the EDJ [27]. At the same time, there are several factors that help to contain damage accumulation, including stress shielding, decussation and even self-healing [27,28]. Teeth are remarkably resilient, ''built to last" [2].…”

Section: Introductionmentioning

confidence: 99%